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<h1> words/doplusloop.asm </h1> |
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<pre> |
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; ( n1 -- ) |
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; R(llimit counter -- limit counter+n1|) |
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; runtime of +loop |
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;VE_DOPLUSLOOP: |
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; .db 7, "(+loop)" |
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; .dw VE_HEAD |
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; .set VE_HEAD = VE_DOPLUSLOOP |
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XT_DOPLUSLOOP: |
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.dw PFA_DOPLUSLOOP |
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PFA_DOPLUSLOOP: |
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pop zl |
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pop zh |
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add zl, tosl |
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adc zh, tosh |
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loadtos |
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PFA_DOPLUSLOOP4: ; entry point for (loop) |
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pop temp2 |
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pop temp3 |
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cp zl, temp2 |
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cpc zh, temp3 |
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sbrs tosh, 7 ; if msb is set, increment is negative. in that case skip the next instruction |
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rjmp PFA_DOPLUSLOOP2 ; jump to test for positive overflow |
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brlt PFA_DOPLUSLOOP1 ; exit if underflow |
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rjmp PFA_DOPLUSLOOP3 |
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PFA_DOPLUSLOOP2: |
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brge PFA_DOPLUSLOOP1 ; exit if overflow |
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PFA_DOPLUSLOOP3: |
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; next iteration |
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push temp3 |
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push temp2 |
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push zh |
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push zl |
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rjmp PFA_DOBRANCH ; read next cell from dictionary and jump to its destination |
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PFA_DOPLUSLOOP1: |
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pop temp0 |
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pop temp1 ; remove leave destination |
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adiw xl, 1 ; skip branch-back address |
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rjmp DO_NEXT |
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